package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/*
检查用户是否完成登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher(); //路径匹配器

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求的uri
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", requestURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //如果不需要处理，直接放行
        if (check) {
            filterChain.doFilter(request, response);
            return;
        }
        log.info("本次请求不需要处理：{}", requestURI);

        //如果已登录，直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录,用户id为：{}", request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");

            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录,用户id为：{}", request.getSession().getAttribute("employee"));
            Long userId = (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
        //如果未登录，返回登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }

    //路径匹配，检查本次是否需要放行
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }

}
